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Fuyuhiko had a strange habit. That is, when the father leaves the house on a business trip, he takes a peek at the bath of his mother, Ayumi. My mother, who actually knew about such a son, called out to Fuyuhiko, who had peeked as usual, "Let's join together." Fuyuhiko was confused by the sudden thing, but from that day on, the bathroom became a forbidden place for both of them.